#version 430

void main(void) {
  if(gl_VertexID == 0)
    gl_Position = vec4(0.25, -0.25, 0.0, 1.0);
  else if(gl_VertexID == 1)
    gl_Position = vec4(-0.25, -0.25, 0.0, 1.0);
  else
    gl_Position = vec4(0.25, 0.25, 0.0, 1.0);
}